Adapter for incandescent-lamp sockets.



No. 888,378. PATENTED MAY 19, 1908.

M. M. WOOD.

ADAPTER FOR INGANDESOBNT LAMP SOCKETS.

APPLIOATION FILED NOV. 15. 1904.

Fig. I.

Witnesses: Inventor:

J'ZZAW montraville Tn.Wood.

m W by UNITED STATES PATENT ormon.

MONTRAVILLE M. WOOD, OF S(.IIENE(JTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A (-ORPORA'IION OF NEW YORK.

ADAPTER FOR INCANDESCENT-LAMP SOCKETS.

Specification of Letters Patent.

'Patented May 19, 1908.

Application filed November 15, 1904. Serial No. 232,870.

To atl whom it may concern:

Be it known that I, MONTRAVILLE M. WOOD, a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Adaptors forIncandescent-Lamp Sockets, of which the following is a specification.

The present invention relates to means for supporting and electricallyconnecting incandescent electric lamps in circuit, and more particularlyto adapters for use in adapting a standard lamp socket or receptacle forthe reception of an incandescent lamp of another form or size.

The object of my invention is to provide a compound adapter which may beused for adapting a standard socket or receptacle for the reception ofmore than one other type or size of lamp.

In carrying out my invention I provide a reversible adapter having lampreceiving means at both ends of different size or shape so that wheninserted in a standard socket or receptacle it will receive a lamp ofone type or size, and when inserted in the opposite direction it willreceive a lamp of a dill'erent size or type.

For a more complete understanding of the invention, reference may be hadto the following detailed description and the accompanying drawingforming a part of this specification, in which Fi ure 1 shows insectional elevation a stan ard Edison receptacle with an adapterembodying one form of my invention applied thereto and supporting anincandescent lamp having an Edison base of slightly smaller size thanthe base of the standard Edison lamp; and Fig. 2 is a vertical sectionof the adapter reversed and having in engagement therewith anincandescent lamp having an Edison base of still smaller size.

- The adapter shown has a base 1 of porcelain or other insulatingmaterial of cylindrical shape having perigheral threads 2 formed thereonanda metallic screw shell 3 fitted tightly thereto. In the ends of thebase are formed cylindrical cavities 4, 5 of different diameters andseparated at their inner ends by a transverse barrier 6. The walls ofthe cavities are provided with screw. threads and have fitted thereonmetallic screw shells 7, 8 which are connected at their outer ends withthe adjacent ends of the outer shell 3. Extending axially through thebarrier 6 is-an aperture 9 in which is slidahly mounted a double headedpin or bolt 10 which constitutes a center contact for the adapter.

The standard Edison lamp socket or receptacle is, as shown in Fig. 1,provided with a threaded outer contact 11 adapted to be connected to oneside of an electric circuit, and a center contact 12 insulated from theouter contact and adapted to be connected to the other side of thecircuit, and when an adapter constructed as above described is insertedtherein the screw shells 7 and 8 are electrically connected to thecontact 11 of the socket through their connections with the outer screwshell 3 and the contact of the latter with the inner surface of thecontact 11 of the socket. When a lamp base 13 is inserted in one of thescrew shells 7, 8 the center contact of the lamp engages the lower endof the pin or bolt 10 and forces it up until the upper end thereofengages the center contact 12 of the socket and thereby completing theelectric circuit through the lamp.

I do not desire to restrict myself to the particular form or arrangementof parts herein described and shown, since it, is ap arent that they maybe changed and modifier without departing from my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. A double ended adapter for sockets and receptacles having provisionsat both ends for engaging and electrically connecting the outer contactof a lamp, andindependentlyadjustable means for connecting the centercontacts of alamp and the socket or receptacle.

2. An adapter having a side contact electrically connected with contactsat both ends thereof, and a longitudinally-movable center contact.

3. An adapter having a base, a side contact, a shell contact at eachend, and a 1011- gitudinally-movable center contact.

4. An ada ter having a cylindrical base provided wit 1 end cavities,connected metalic shells respectively secured to the peripheries of saidbase and said cavities, and a In .wit ness whereof I have hereunto setmy metallic bolt or rod longitudinally movable hand thls 14th day ofNovember, 1904. througgsaid base.

adapter having a base, screw shell MONTRAVILLE WOOD 5 C0 Ilt8,CtS 0fd1fierent sizes in opposite ends of Witnesses said base, and a centercontact msulated ALEX. F. MACDONALD,

from beth screw shells. HELEN ORFORD.

